Discovery

Map of maps

Sorry, OSI mapping is not freely available online (It is partially available on the OSI website). "Open Topo", based on OpenStreetMap, is a good alternative.

Bing OS 25K OpenStreetMap Google OS 50K
 
GB only         OS Tutorial 1:25K Legend 1:50K Legend Get OSM Maps free on your phone

GPX Editor

Record map clicks

Reload map

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